A man has admitted defacing a Mark Rothko canvas at the Tate Modern worth tens of millions of pounds. Eyewitnesses said the man wrote some words with a black pen on one corner of the 1958 work "Black on Maroon".

The Tate Modern is to open its new extension opens to the public today. The underground spaces for performance art are called The 'Tanks'. The launch marks the first phase of a project costing more than fifty-seven million pounds. Much of the money has come from public and private donations.